Improvement in sewer-gas traps



W. M. ALLEN. Sewer-Gas Traps.

No. 206,210. Patented July 23,1878.

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UNITED STATES PATENT OFFICE.

\VILLIAM M. ALLEN, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT lN SEWER-GAS TRAPS.

Specification forming part of Letters Patent No. 206,210, dated July 2?,1878; application filed May 29, 1878.

To all whom it may concern:

Be it known that 1, WILLIAM M. ALLEN, of Boston, in the county ofSuffolk and State of Massachusetts, have invented an Improved Device forPreventing the Escape of Sewer- Gas from the Overflow-Pipe of aW'ash-Basin, of which the following is a specification:

The object of my invention is to provide a simple and efiective meansfor preventing the escape of sewer-gas into rooms from the overflow-pipeof a wash-basin.

The invention consists of a flexible disk or pad of vulcanizedindiarubber or other suitable material, having aprojectin g rim aroundthe edge on one side, and on the same side two corrugated projections orteats, which latter are designed to be inserted into corresponding holesin the basin leading to the overflow-pipe, so as to hold the disk inplace, the flexible disk adapting itself to the concave surface of thebasin, and the projecting rim inclosing the area comprising the holes,so as to effectually close them, and thus prevent the escape of gas intothe room. The whole is to be made in one piece by being pressed in adie. 1

The accompanying drawing is a perspective view of a pad embodying myinvention.

A represents a thin disk or pad of flexible india-rubber, having aroundits edge on one side a projecting rim, B. On the same side or surfacewith the rim B, and forming a part of the pad A, are two projections orteats, 0, arranged essentially as shown. These projections C aredesigned to be inserted into corresponding holes in a wash-basin thatopen into the overflow-pipe, so as to secure the pad in place. Two ofthese projections are considered sufficient for this purpose.

In order to facilitate the fitting of the project-ions O in theoverflow-holes, and to adapt them to holes of different sizes, I make alongitudinal wedge-shaped opening, D, of which there may be one or more;or they may be corrugated for the purpose of allowing them to becompressed as they are forced into the holes, and thus more securelyhold the pad in place. Instead of being notched or corrugated, theprojections C may be made hollow for the same purpose.

The projecting rim or lip B entirely surrounds the area comprising theoverflow-holes, and, in consequence of the flexibility of the pad, therim B readily conforms to the concavity of the basin,and is caused tofit snugly over the surface surrounding the holes, and thus effectuallyprevent the escape of deleterious gases into the room. 4

My device is very easily applied, and can readily be removed whennecessary. It is adapted to be used in basins already in use. Thearticle is designed to be made in one piece of vulcanized india rubberpressed in a die, and can be furnished at small cost.

The rim B may be dispensed with and a plain flat flexible pad be used.

hat I claim as my invention is-- The flexible pad A, provided with thepro jecting rim l3 and compressible projections or teatsG, all in onepiece, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

IVILLIAM M. ALLEN.

\Vitnesses J. H. ADAMS, TuonAs LALLY.

